Oscillation generator



Dec. 3, 1929. L. E. BARTON 1,738,346

OSCILLA'I'ION GENERATOR Filed Dec. '14, 1926 Inventor Loy E. Bavton H1 I Attorney e e s r it LOY E, BARTON, OF

SCHENECTADY, NEW YORK, ASSIGNUR L70 ELECTRIG COMPANY, A. CORPOEATIDN OF NEW YORK OSCILLATION GENERATOR Application filed December 14, 1926. Seriei No. ween.

My invention relates to alternating cur rent generators, particularly oi the electron discharge type, and has for its purpose to provide a generator which is simple in its ch cuit arrangement and which has the property of eiiicicntly generating a broad range or frequencies.

More particularly my invention relates to alternating current gtgenerators oi the t pc described in Patent :tthhddfitiit issued M is 30, 1925, to W. C. White. has for its purpose so to improve generators of this t y pe that they may he more economically constructed and will operate more c'liicicutly, particularly at the lower frequencies.

The novel features which lt believe to be characteristic of my invention are set forth with particularity in the appended claims. My invention itself, however, both as to its organization and method of operation will best be understood by reference to the following description taken in connection with the accompanying drawing, in which l have illustrated one form oi my invention.

in the drawing, 1 denotes an electron dis charge device of the common type having a cathode 2, an anode 8 and a grid 1, 5 denotes a feed back transformer of the high impedance iron core type in which one side of the primary winding 6 and secondary 7 are connected together at the point 8 and tlnourgh conductors 20 and 19 of the cathode 2. The opposite side of the secondary winding 7 is connected tothe grid 1 by means of the conductor 22 through the usual grid leak and condenser combination 9. lhe primary 6 ol the feed back transformer is connected through a conductor 10 and a blocking condenser 11 to the anode 3. The main oscillatory circuit of my generator is made up of the variable inductance 12 connected in parallel with a variable condenser 13, altho it is to be understood that any convenient term ot tuninc; arrangement may be employed. @no side of this combination is connected through a conductor 14 directly to the anode of the electron discharge device. The other side of this combination is connected through a source of direct current potential 15 and conductor 19 to the cathode 2. A condenser 16 is connected across the source of direct current potential 15 to permit the passage oi' the hi h frequency current and to shuntthe same out oi the source 15. The cathode 2 in he heat ed from any suitable source such the battery 17. A secondary coil 8 is provi which is inductively coupled with veil. inductance 152 in order to provide an output circuit for t e aitcrna ii current energy. To this 'oil y be connected any load circuit to wl lch it is desired to supply oscillatory power. it is, of course, to be understood that any other suitable means may be employed for connecting the load 01 'cuit to the 050 113 circuit.

it is seen that with this arrangement the main oscillatory circuit comprises inductance 12 and a capacity 13 or other. table arrangement of inductance and capacity and that o.- cillations are excited in this circuit through a circuit con'iprisi the space between the cathode 2 and anode 3 of the electron discharge device, conductor 1 1, oscillatory circuit 12., 13, conductor 23, condenser 16, conductor 19, back to cathode 2. Due to the fact that the transformer 5 has very high impedance windings a very small amount oi oscillatory energy will be transferred through the circuit including; conductor 9. 0, primary winding 6 of the transiormer 5, conductor 10, condenser 11 to the anode 3. This being the case only a very small amount of ener y will be transferred back into the inputcii cuit oi the electron discharge device which come S the secondary of the transformer 7, cond ccor 22, grid lealr and condenser combination 9 to the grid. tiince the energy which passes through the high impedai 1e feed back coils is very small no turning or those circui i is necessary. At the same time the energy trans fer-red back into the input circuit alt-hot h small is euflicient to maintain an oilicient os cillating condition in the tube circuits.

[Thus it may be seen that with this circuit the main oscillatory circuit l2, 13, of the generator is substantially isolated from the feed backtranstornier 5, and that a very small amount of the energy of the oscillatory circuit 12, 13 is ted back to the input circuit ot the electron discharge device. With this arrangement a very broad range of frequencies may be obtained by adjusting the constants of the oscillatory circuit 12, 13 and practically a pure sine wave may be obtained throughout the whole range.

My invent-ion has a further advantage, and one which has not been obtained in the pat ent mentioned or in the prior art, in that the anodepotential is applied through the oscillatory circuit 12, 18, rather than through the windings of the feed back transformer 5.

Since the windings of the transformer 5 carry no direct current this transformer may be constructed without regard to direct current considerations. Both the windings and the core may be greatly reducedin size resulting in a very small closely coupled iron core transformer, designed entirely accord- 7 ing to principles of alternating current theory. .The resulting construction is an iron core transformer which may be more cheaply constructed than those which have been necessary heretofore and one which improves the efficiency of the circuit as a whole.

While I have illustrated and described only one embodiment of my invention it will be obvious that my invention is by no means limited to the particular embodiment indicated, but that many modifications in the circuit connections employed may be made without departing from the scope of my invention as set forth in the appended claims.

What I claim asnew and desire to secure by Letters Patent of the United States, is:

1. The combination in a system for producing electrical oscillations of an electron discharge device having a cathode, an anode and a grid, a circuit connected between said cathode and said anode comprising an oscillation circuit and a source of current, a nonresonant circuit between cathode and anode com risin capacit and inductance a se 3&-

lation circuit and a source of current, a second circuit between cathodeand anode including an inductance, and a separate circuit between cathode and grid containing an inductance which is coupled to the inductance in said second circuitbetween cathode and anode, the frequency of the oscillations being determined principally by the constants of said I oscillation circuit and said first-mentioned inductance offering a high impedance to current of the frequency produced thereby to limit the load on said oscillatory circuit resulting from grid excitation to a desired value.

3. The combination in a system for producing electrical oscillations of an electron discharge device having a cathode, an anode and a grid, a circuit between said cathode and said anode including an oscillation circuit and a source of current, a non-resonant separate circuit between said cathode and said anode, a separate circuit between said grid and said cathode, said separate circuit between said cathode and said anode being closely coupled to said separate circuit between said grid and said cathode in order to supply to the circuit between grid and cathode energy from the circuit between anode and cathode for maintaining oscillations in the system the frequency of which is determined by the constants of the oscillation circuit.

4. In an oscillation generator the combination of an electron discharge device having an anode, a cathode and a grid, a circuit connected between said anode and said cathode including an oscillation circuit and a source of current, a transformer having a primary winding and a secondary winding one side of said primary winding being connected directly to said cathode, the opposite side of said primary winding being connected through a condenser to said anode, said secondary winding being connected in circuit between said rid and said cathode, the circuit between said anode and grid comprising the primary and secondary windings of said transformer being non-oscillatory.

In witness whereof, I have hereunto set my hand this 18th day of December, 1926.

LOY E. BARTON. 

